/*
 * Copyright (c) 2009, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package test.java.math.BigDecimal;

/*
 * @test
 * @bug 1234567
 * @summary Test that precision() is computed properly.
 * @author Joseph D. Darcy
 */

import java.math.*;
import static java.math.BigDecimal.*;

import org.testng.Assert;
import org.testng.annotations.Test;

// Android-changed: Replace error counting with asserts.
public class PrecisionTests {
    private static BigDecimal NINE = valueOf(9);

    @Test
    public void testPrecision() {
        // Smallest and largest values of a given length
        BigDecimal[] testValues = {
            valueOf(1), valueOf(9),
        };

        testPrecision(new BigDecimal(0), 1);

        for(int i = 1; i < 100; i++) {
            for(BigDecimal bd : testValues) {
                testPrecision(bd, i);
                testPrecision(bd.negate(), i);
            }

            testValues[0] = testValues[0].multiply(TEN);
            testValues[1] = testValues[1].multiply(TEN).add(NINE);
        }

        // The following test tries to cover testings for precision of long values
        BigDecimal[] randomTestValues = {
            valueOf(2147483648L),          // 2^31:       10 digits
            valueOf(-2147483648L),         // -2^31:      10 digits
            valueOf(98893745455L),         // random:     11 digits
            valueOf(3455436789887L),       // random:     13 digits
            valueOf(140737488355328L),     // 2^47:       15 digits
            valueOf(-140737488355328L),    // -2^47:      15 digits
            valueOf(7564232235739573L),    // random:     16 digits
            valueOf(25335434990002322L),   // random:     17 digits
            valueOf(9223372036854775807L), // 2^63 - 1:   19 digits
            valueOf(-9223372036854775807L) // -2^63 + 1:  19 digits
        };
        // The array below contains the expected precision of the above numbers
        int[] expectedPrecision = {10, 10, 11, 13, 15, 15, 16, 17, 19, 19};
        for (int i = 0; i < randomTestValues.length; i++) {
            testPrecision(randomTestValues[i], expectedPrecision[i]);
        }
    }

    private static void testPrecision(BigDecimal bd, int expected) {
        int precision = bd.precision();

        Assert.assertEquals(precision, expected,
                String.format("For (%s).precision expected %d, got %d%n", bd, expected, precision));
    }
}